I have a question about speaking.
It is said that you could get better score if you repeated a question to start your answer.
For example, if the question followed was asked;'Do you think boys and girls prefer different toys?', then I'd better answer like this;'Yes, I think they prefer different toys' other than 'Boys usually prefer toys that they could play wild....'

Hi Simon! Just to clarify- you mentioned that using informal words (x. phrasal verbs) will help us get a higher score in speaking. Is this the opposite in writing, because isn't that in writing we need to use formal words instead?

There are different degrees of informality. The phrases used above are not "bad" or "slang" - they are normal phrases that native English speakers use in conversation, and would therefore impress the examiner.